Burner valve construction



Feb- 8, 1966 c. D. BRANSON ETAL 3,233,830

BURNER VALVE CONSTRUCTION N 1 lw www .t NSC e ALL e RLA h SBWM q H R Y Umw? N EDH Dn WNBA O h V OH T S NSRR M 3 lm SU RCI-H Mmm CJA Feb- 8, 1956c. D. BRANSON ETAL 3,233,830

BURNER VALVE CONSTRUCTION Filed June l5, 1962 3 Sheets-Sheet 2 AMES R RTw|LLsoN F |G"2 RTHUR (EERRY MALCOM www ATTORNEY Feb- 8, 1966 c. D.BRANSON ETAL 3,233,830

BURNER VALVE CONSTRUCTION Filed June 15, 1962 5 Sheets-Sheet 3 |36 |50|84 |60 |56 |52 INVENTORS CHARLES DAVID BRANSON FIG-5 JAMES ROBERTw|LLsoN ARTHUR HARRY MALCOM BY @Ml/Mw ATTORNEY United States Patent O f'3,233,830 BURNER VALVE CONSTRUCTION Charles David Branson, James RobertWillson, and

Arthur Harry Malcom, Greensburg, Pa., assignors to Robertsllaw ControlsCompany, Richmond, Va., a corporation of Delaware Fiied June 15, 1962,Ser. No. 202,789

7 Claims. (Cl. 236-99) This invention relates to an improved burnervalve construction.

A feature of this invention provides a burner valve construction inwhich the closing spring action on the valve increases in strength asthe valve moves toward its valve seat and decreases in strength as suchvalve moves away from its valve seat.

Another feature of this invention provides a substantially snap-actionby the combined action of a local vaporizing thermostatic action in aliquid line to a thermostatic motor in combination with a spring actionon the valve which increases in strength as the valve closes and thethermostatic vapor condenses7 and which spring action decreases instrength as said portion of thermostatic liquid vaporizes to receive aquick yielding impulse to open said valve as the liquid vaporizes.

Another feature of this invention provides a lever and springconstruction acting on a valve in a manner to apply an increasing valveclosing torque as the valve moves toward its valve seat and vice-versa.

Another object of this invention is to provide a burner valveconstruction having one or more of the features herein disclosed.

Another object of this invention is to provide a system for burneroperation having one or more of the features herein disclosed.

Other objects are apparent from this description and the accompanyingdrawings in which:

FIGURE 1 is a diagrammatic representation of a burner system embodyingthis invention.

FIGURE 2 is a diagrammatic representation, on enlarged scale, of a partof the main gas burner, the pilot burner, the burner gas valve, and thethermostatic control for the gas valve.

FIGURE 3 is a perspective View of the needle construction for thedischarge conduit of the burner gas valve.

FIGURE 4 is an enlarged longitudinal vertical cross section of the pilotburner construction.

FIGURE 5 is a view of a portion of FIGURE 2 with the valve in openposition.

FIGURE 6 is an end view of the main gas burner and pilot burner.

FIGURE 7 is an enlarged cross section of the valve actuating means shownin FIGURE 2 taken from the opposite side.

FIGURE 8 is a top view of the valve actuating lever.

FIGURE 9 is a top view of the supporting fulcrum lever.

FIGURE 10 is au enlarged view of the fulcrum construction.

Certain words indicating direction, relative position, etc. are used inthis application for the sake of brevity and clearness. However, suchwords are not intended as limitations and apply only to theillustrations in the drawings. The actual constructions used may havedifferent directions, relative positions, et-c. Words such as vertical,horizontaL upper, lower, etc. are types of words which are used in thismanner.

Referring first to FIGURE 1, an oven may be provided with a main gasburner 22, a pilot construction 24, a main burner gas valve construction26, a gas supply pipe 2S. A thermostatic control c-onstruction 30 mayPatented Feb. 8, 1966 have a thermostatic bulb 32 in the oven 2) whichcauses said thermostatic control construction 3i) to control the heatingaction of the burner 22 to produce desire-d temperatures in the oven 20.A main gas valve 33 may control the flow of gas to the system shown inFIGURE 1.

The pilot construction 24 may be of a character such that it produces astand-by pilot flame 34, FIGURE 4, incapable of igniting the burner 22,and an igniting iiame 36 capable of igniting the burner 22.

The stand-by pilot flame 34 is incapable of heating the thermostaticbulb 35 sutiiciently to cause such bulb 35 to cause gas to be suppliedto the main burner 22 by the gas valve 26. The flame 36 is of such size,or construction, or shape, that it is capable of heating thethermostatic bulb 35 to cause gas to be supplied to the burner 22 by thevalve 26 so the burner may be ignited by the igniting llame 36.

The pilot construction 24 may include a nozzle 38, which receives gasfrom the pipe 40 and discharges it through an orifice 42 in sutiicientquantity to produce the stand-by flame 34 under one type of control, andto produce the igniting flame 36 under a diiferent type of control.

The gas is discharged from the orifice 42 as a jet 44 which entrains aquantity of atmospheric air entering through one or more oriiices 46 inthe side of connector 48.

When the stand-by arne 34 is to be produced, the gas entering the nozzle38 is of limited quantity and pressure so that only a small amount ofgas and air are fed to the shield 50. The shield 50 may be invertedchannel-shaped in cross section, and may have a downwardly open elbow 52which guides the gas and air mixture to the first pilot burner aperture54 through which the limited amount of gas and air pass and form thestand-by pilot iiame 34. The aperture 54 may be provided with a smallhood S6 which aids in controlling the formation of the llame 34.

The stand-by Calibrating valve 58, FIGURE 1 may be adjusted so that thestandby pilot iiame 34 is a small blue flame, and the small blue flameis the calibration indicator to show that the pilot flame has beenadjusted to the desired size.

The production of the standby pilot flame on top of the shield 50prevents undesired heating of the thermostatic bulb 35 during thestandby conditions.

The hood 50 has a downwardly slanting channel 60 with an open end 62 andone or more additional small hoods 64, and igniting flame apertures 65.The construction is such that when a larger quantity of gas is fedthrough the nozzle 38, by the thermostat construction 30, then theigniting llame 36 is produced, which burns at 36, 36A and 36B as gas andair mixture are fed under the small hood or hoods 64, and out of the end62, and these igniting flame portions are suiiiciently high to ignitethe burner gas which is discharged through the burner orifices 66. Itdesired, the orifices 66 may be slightly downwardly slanted along theside 68 of the burner. The end 7 0 of the burner 22 may also be providedwith orifices 66 which carry the ignition to the other similar side 68Aof the burner.

The igniting flame 36 burns at 36B, under the end of the hood 50, sothat the iiame 36B heats the bulb 35 either by direct Contact, orbecause of close proximity, so that a portion of the liquid mercury, orother thermostatic liuid in the bulb 35, has its liquid phase changed toa gaseous phase to produce a quickly increasing thermostatic fluidpressure in the thermostatic fluid enclosure of which the bulb 35 is apart. The 4tube 72 and thermostatic motor 74 form the remainder of thetherm-ostatic iiuid enclosure.

When the igniting flame 36, 36A and 36B ceases to be produced, thechannel-shaped shield or hood promotes the upward flow of cooling air'in contact with 4the thermostatic bulb 35 to cause quick cooling actionof the bulb 35, The notches 51 at the elbow 50 promote this coolingaction.

The bulb 35 is connected by a tube 72, which forms a part of thethermostatic fluid enclosure, and which is connected to the thermostaticmotor 74, in the burner gas valve construction 26, to cause burner gasto be supplied by the burner gas valve construction 26 to the burner 22in response to temperatures produced by the burner 22, as elsewherefurther described. The size of the igniting flame 36, 36A and 36B may beregulated -by an igniting flame regulating valve 76, FIGURE l.

The construction is such that when the temperature in the oven 20, asproduced by the burner 22, is below a selec-ted level, the thermostaticbulb 32 causes the thermostatic construction 30 to feed an igniting ameproducing amount of gas through the igniting gas pipe 78, FIGURE l. Thepipe 78 is connected to the pilot burner pipe 40. This causes the largeigniting arne 36, 36A and 36B to be produced in the pilot construction24. This heats the pilot thermostat bulb 35, which in turn actuates orexpands the thermostatic motor 74 and causes burner gas to be fed by theburner gas valve construction 26 to the burner 22.

This heats the oven 20 until the temperature in the oven 20 reaches thedesired maximum, at which time the thermostatic bulb 32 causes pilot gasto cease to be fed through the pipe 78, which in turn causes theigniting pilot flame 36, 36A and 36B to cease to be produced. Thispermits the pilot bulb 35 to cool and thereby restore the thermostaticfluid to the liquid phase throughout the fluid enclosure, and to causethe burner gas valve construction 26 to cease feeding burner gas to theburner 22.

The thermostatic motor 74 may include a pair of telescoped resilientcup-shaped diaphragms 75A and 75B, which are sealed together at theflanges 75C to form an expandable diaphragm for thermostatic motor 74into which the liquid mercury is forced when the mercury in bulb 35 isvaporized.

A suitable bracket construction 80, of any desired shape, may beprovided to hold the hood 50, the nozzle construction 49 which holdsnozzle 38, and the bulb 35 adjacent to the burner 22. If desired, thisbracket construction 80 may be secured by the flange 82 to the top -ofthe burner by one or more screws 84.

The thermostatic control construction 30, FIGURE 1, may be of anysuitable character capable of controlling the ow of igniting burner gasthrough the pipe 78 in response to the temperatures registered by thethermostatic bulb 32. A suitable knob 86 may be included, which Vadjuststhe thermostat valve construction 88, so the construction 88 causes gasto be fed from the pipe 90 and gas supply 28, through the regulatingvalve 76 and pipe 78 to the pipe 40 and nozzle 38.

Standby pilot gas may be fed through standby pipes 92. and 94, and thestandby llame regulating valve 58, to the pipe 40 and from thence to thenozzle 38. The regulating valve 58 may be supported on the thermostatcasing 96, or the pipes 92 and 94, and valve 58 may be entirely separateand independent from the casing 96, as desired.

The thermostat control construction may feed standby gas continuouslythrough the pipes 92, 94 and 40, as regulated by an adjustable orificevalve 58, so the standby flam'e 34 only is formed when 11o gas is fedthrough the pipes 90 and 78 when the thermostat valve 8S is closed bybulb 32 when the oven 20 is sufliciently warm. However, when the ovencools below a desired level, the bulb 32 opens the valve 88 and feeds alarger amount of gas through pipes 96, 78 and 40, and regulating valve78 to produce the igniting ame 36, 36A and 36B.

The burner gas valve construction 26 may have a burner gas dischargeconnection 100, `which has an adjustable orice 102, which discharges theburner gas in the form of a jet stream past the well known gas and airmixing construction 104. The rate of discharge at the orice 102 may beregulated by turning the gas connector 100, to cause the threadedconstruction 101 to regulate the jet 102, as desired.

The burner gas valve construction 26 may have a discharge valve seatconnected in gas flow relationship to the burner 22, as by the connector110, which discharges into the nozzle construction 100.

The jet construction may include a lower passageway 109A which isthreaded on the upper portion 101 of connector 110 and is adjustable upand down by said threaded construction.

A jet piece 100B has a larger bore 100C and the mini'- mum iiow passage100D. The Upper end 100B of construction 100 has an internal conicalbore 103013 which may seal against the upper conical end 100G to forceall the gas through passage 100D.

T-he conical bore 100H is tapered so it does not seat against the upperslanting ends 100] of wings 100K so a tight seal may be formed at 100F.

The wings 100K are driven in the bore 100L and against the shoulder100M.

The construction 100 may be turned to its lowest position to produce aminimum discharge through passage 100D or construction 100 :may beadjusted upwardly by the threaded construction to produce a bypassbetween 100F and 100G soa llarger amount of gas may be fed to the mixer104.

A valve 112 may seat ony the valve seat 108, and, if desired, may have asealing disc 114 to engage .the seat 108 in effective sealingrelationship. i

A guide pin 116 may have a head 118 to guide valve 112 through themedium of a cylindrical opening 120. The downward movement of the valve112 may be limited by the end wall 122 of the opening 120 when the wall122 engages the head 118. The pin 116 may be uted and driven into thecylindrical opening 124 of the elongated tubular valve casing 126, tothe proper level properly to limit the downward movement of valve 112.

The thermostatic motor 74 may have means to move the valve 112 towardsaid valve seat 108 when the igniting flame 36, 36A, 36B, or a similarame, ceases to be produced. Such means may also move the valve 112 awayfrom the valve seat 108 when such igniting llame 36, 36A and 36B isproduced. This action is indirectly in response to the control of theignition gas by the thermostatic bulb 32 and thermostat 30 in responseto the temperature in oven 20. The action maintains the temperatureinthe oven 20, or other heated object, within selected temperaturelimits.

The means to move the valve 112 may include a spring construction ormeans 128, FIGURE 7, acting to aid in moving the valve 112 toward thevalve seat 108', and increasing the valve seating strength as the valve112 moves toward the valve seat 108 and decreases in strength as saidvalve 112 moves away from said valve seat 108.

The construction is such that the valve 112 is quickly opened when aportion of the mercury in bulb 35 is vaporized and is quickly closedwhen the vaporized portion is cooled and condensed. This quick openingand closing of valve 112 is in response to the existence ornon-existence of ignition ame 36, 36A, 36B, or similar control flame.

The thermostatic motor 74, tube 72 and bulb 35 form a thermostatic.fluid casing which is heated by the igniting iiame 36, 36A, and 36B. Aportion of the thermostatic fluid in the thermostatic casing, such as inbulb 35, may change phase when it is heated by said igniting flame 36Bor similar flame. For example, the bulb 35'and the tube 72 and thethermostatic motor 74 may contain mercury in liquid form at normalatmospheric temperature, and the fluid casing so produced by thesemembers may be charged with liquid mercury through the opening 13.0,

FIGURE 7, after which the ball 132 may be welded to the opening 130, onthe motor head 134, which is secured to the diaphragm 75B.

A suitable wire 136 may be placed in the tube 72 to reduce the amount ofmercury used in the tube 72, and may be chosen of such material, that itmay compensate for the expansion and contraction of the tube 72 andliquid mercury due to surrounding temperatures, so such atmospherictemperature changes, and other temperatures which do not vaporizemercury (below 700 F. more or less) do not affect the valve 112.

v The portion of the thermostatic fluid, or mercury, which is in thebulb 35 may change phase. For example, the liquid mercury in bulb 35 maybe vaporized at temperatures of 700 F., more or less, and the productionof this vapor causes a quick and elastic movement of the ball 132 to.produce an action which approaches a snap-acting opening and closing ofthe valve 112, depending upon the change from liquid mercury to mercuryvapor and vice-versa.

The valve moving means or spring construction 128 may include a valveactuating lever 136 having a lever fulcrum 138 and a valve actuatingportion 140, which are separated from each other. The thermostatic motor74 has means, such as the ball 132, to move the lever 136 and valve 112toward and away from the valve seat 108.

yThe spring construction l128, may include a relatively Estrongcompression spring 142 lwhich cooperates with the -lever 136 to move thevalve 112 toward the seat 108.

Thespring construction 128, which may include the relativelyifstrongspring 142, with or without an additional relatively weak compressionspring 144, cooperates wit-h the lever 136 to move the valve 112 towardthe seat 108. The spring` construction 128 increases in valve seatingstrength-as the valve 112 moves toward the valve seat 108. and decreasesin strength as the valve 112 moves away from the valve seat 108.

A lost motion notch 145 may be provided in valve 112 to vpermit thelever 136 to impart an additionally quick opening motion tothe valve 112as the mercury starts to vaporize.

.A -supporting fulcrum 146 cooperates with the lever fulcrum 138 to holdthe lever 136 in pivoting position. The lever fulcrum 138 may be.hook-shaped as at 148 and engages the knife edge of the stationary orsupporting fulcrum'146. The compression spring 142 pulls the hook typefulcrum 138 tightly against the stationary or supporting fulcrum 146, ina rightward direction in FIG- URES 7 and l0.

The supporting fulcrum 146 may be adjustable up and down, for example,to adjust and calibrate the opening 150 which is adjustable to adjustthe supporting fulcrum The lever'150 may be pivoted by hooks 152inserted in openings 154 in the valve casing end wall 155. The lever 150is adjustable by the pin 156, which may be longitudinally adjusted, asby the threaded construction 158 which has a screw head 160, forlongitudinal engagement.

A suitable Valve casing cover 157 may be bolted on the end wall 155after the lever 150 has been positioned. The cover 157 may carry thethermostatic motor 74 so the ball 132 engages lever 136.

The compression spring 142 has a first spring part, such as one end 161which engages the lever 136, through the medium of a disc 162 whichengages the lever 136 at a first spring fulcrum 164.

A second spring part 166, which may be the other end of the spring 142,may engage a second spring fulcrum 168, which is carried at the end ofthe lever 150.

The spring fulcrums 164 and 168 are so located to produce a valveclosing torque, as indicated by the dotted Iline in FIGURE 7, whichextends from the fulcrums 138 and 146 to the right'angled intersection172 with the extended line 174 from the spring fulcrums 164 and 168.

The first spring fulcrum 164 swings about the arc 176 which is centeredabout the fulcrums 138 and 146. The fulcrum 168 is stationary during theoperation of the device and is movable only for adjustment purposes.Therefore, the extension line 174 moves toward the ulcrums 138 and 146as indicated at 174A as the valve 112 moves away from the valve seat108. Hence the intersection 172 likewise moves towards the fulcrums 138and 146, as indicated at 172A as the valve 112 moves away from the valveseat 108. The line 170 is indicative of the torque produced by therightward pull of the line 174 (in FIGURE 7) due to the compressionspring 142. It produces a counter-clockwise torque about the fulcrums138 and 146 which increases in length and strength as valve 112 movestoward the seat 108, and decreases in length and strength as the Valve112 moves away from the valve seat 108.

This increase in spring torque 170 as the valve 112 moves toward thevalve seat 108 causes a quick closing movement of the valve. Conversely,the decrease in spring torque 170 as the valve moves away from the valveseat 108 causes the Vvalve 112 to have a quick opening movement. Thisaction is amplified by the resiliency of the mercury vapor in bulb 135.

The supporting fulcrum 168 cooperates with the adjacent spring fulcrumand is adjustable by the pin 156 to calibrate the action of valve 112.The fulcrum 168 is carried by the lever 15), which is adjustable by thepin 156 about the fulcrums 152 to adjust the supporting fulcrum 168.

The lever 50 is held in locked position by the thrust of the ball 132,the openings 154, and the pin 156.

The lever 150 may be adjusted by the pin 156 to cause any relativemovement between the line 174 `and the fulcrums 138 and 146. ForAexample, it may be preferred to cause the extension line 174 to be at,or just slightly below the fulcrums 138 and 170 when the valve 112 is inthe downward fully opened positiony 112A, and to be a relatively longdistance, such as at 172, when the valve 112 is in the fully closed `andfull line position illustrated in FIGURE7.

The lever 136 may be made of a stamping, such as shown in FIGUREk 8. Thelever 136 has extension shoulders which carry a pair of hook fulcrums138, which act in unison against the pair of knife fulcrums 146, shownin FIGURE 9. FIGURE 9 shows the lever 150 to be a relatively at piece ofmetal with shoulders or hooks 152 carried by an extension 182. Thespring supporting fulcrum 168 is'shown at the right end of FIG- URE 9. Adownward extension 184 is punched into the lever 150 to engageV the pin156. A strengthening ridge 186 is formed to make the lever 150 rigid.

If desired, the spring 142 may have a spring strength of 6 pounds, moreor less at its normal load.` The spring 144 may be relatively weak, andmay have a spring strength of 1.5 ounces, more or less,when at itsnormal load. The spring 142 therefore provides a ve'ry substantialupwardpush on the valve 112 when the valve closes. It is strongest in valveclosing strength or torque when valve 112 is in the fuily closedposition as shown in full lines in FIGURE 7 and has a small valveclosing torque when the valve 112 is open.

The parts which contact the mercury, if used, may be made of materialwhich is not affected by the mercury. For example, the bulb 35, tube 72,Wire 136 and the mercury contacting parts of motor '74 may be made ofstainless steel, or the like.

It is thus to be seen that this invention provides new and useful pilotconstructions, burner gas valve constructions, and combinations thereof.Also new and useful methods of control are provided.

In the fully closed position of the valve 112, and in the fullyretracted position of the ball 132, not shown, the Iball 132 is slightlyspaced from the lever 13.6 to permit the full closing force of thespring 142 to act on the valve 112.

The dotted line position of lever 136 in FIGURE 7 is not its lowestposition when the valve 112 is fully opened. Such lowest position isbelow the dotted line showing. Also the line 174 approaches the fulcrums138 and 146 to a position closer than 172A when the valve 112 is infully open position. Hence the counterclockwise torque of lever 136 isless than the torque at 172A when valve 112 is in fully open position.

While the form of the invention now preferred has been disclosed asrequired by statute, other forms may be used, all coming within thescope of the claims which follow.

What is claimed is:

1. A burner gas valve construction controlling the flow of burner gasfor a burner comprising: an elongated tubular valve casing with a gasinlet at a first valve casing end, with a thermostatic motor receivingopening at a second valve casing end, and with a gas burner connectorreceiving opening in said casing intermediate said casing ends; a valveguide pin insertable in said valve casing in alignment with saidconnector receiving opening; a burner gas valve slidably carried by saidguide pin and having a lever receiving lost motion notch; a gas burnerconnector inserted in said connector receiving opening and having avalve seat opened and closed byY said burner gas valve; a valveactuating lever in said casing with one lever end portion engaging saidlost motion notch, With the other lever end portion having a valve leverfulcrurn adjacent said motor receiving opening and with an intermediatelever portion having a movable spring fulcrum; a fulcrum lever in saidcasing having a normally stationary lever supporting fulcrum engagingsaid valve lever 'fulcrum adjacent said motor receiving opening, havinga hook construction at one end engaging a hook receiving construction atsaid second valve casing end and having a normally stationary springfulcrum at the other end; a compression spring means having end portionsrespectively engaging said spring lever fulcrum and said stationaryspring fulcrum; an end cover removably secured to said second valvecasing end and covering said motor receiving opening; and a thermostaticmotor carried by said cover and engaging said valve actuating lever tooperate said valve actuating lever in combination with said spring meansto move said valve toward and away from said valve seat.

2. A valve construction according to claim 1 in which a spring means isprovided around said guide pin between said valve and said casing whichis relatively weaker than said `first named spring means.

3. A valve construction according to claim 1 in which a calibration pinis provided in said casing and movably actuating said fulcrum lever toadjust said normally stationary lever supporting fulcrum.

4. A valve construction according to claim 1 in which said connectorreceiving opening is transversely larger than said valve and guide pin.

5. A valve construction according to claim 1 in which said thermostaticmotor includes a pair of telescoped resilient cup-shaped diaphragmssealed together and connected to a tube which forms part of athermostatic fluid enclosure, said diaphragms having openings alignedWith said tube and closed by a motor head having an opening closed by aball which contacts and moves said valve actuating lever.

6. A valve construction according to claim 1 in which said valve has acylindrical opening, receiving said guide pin, said cylindrical openinghaving an end wall which engages the end of said guide pin and limitsthe opening movement of said valve.

7. A burner gas valve construction controlling the flow of burner gasfor a burner comprising: an elongated tubular valve casing having a gasinlet at a rst casing end, a thermostatic motor receiving opening at asecond casing end, and a gas burner connector receiving opening in saidcasing intermediate said ends; a valve guide pin inserted in an openingin the wall of said casing opposite said connector receiving opening; agas burner connector inserted in said connector receiving opening andhaving a valve seat aligned with said guide pin; a burner gas valvehaving an axial opening slidably receiving said guideV pin, having asealing disc opening and closing said valve seat, and having anintermediate lever receiving lost motion notch; a valve actuating leverin said casing with one end portion engaging said lost motion notch,with the other end portion having a valve lever fulcrum adjacent saidmotor receiving opening, and with an intermediate movable springfulcrum; a fulcrum lever in said casing having a normally stationarylever supporting fulcrum engaging said lever fulcrum and having a hookconstruction at one end held in said casing adjacent said second casingend, and having a normally stationary spring fulcrum at the other end;compression spring means having end portions respectively engaging saidspring lever fulcrum and said stationary spring fulcrum, and a casingcover removably secured to and covering said opening at said secondcasing end; and a thermostatic motor carried by said cover and engagingsaid valve actuating lever to operate said spring construction and saidvalve to open and close said valve seat with spring strength whichVincreases as said valve closes and decreases as said valve opens.

References Cited by the Examiner UNITED STATES PATENTS 1,112,862 10/1914Spahr et al. 158-118 2,025,413 12/1935 Hegwein et al 23.6-68 X 2,065,48112/1936 Thulman.

2,553,575 5/1'951 Grayson 236-68 2,583,795 1/1952 Pawelsky et al. 236-482,631,659 3/1953 Wright 158-118 2,664,246 12/1953 Ray 236-99 2,874,9242/1959 Good 236-,48 X 2,906,460 9/1959 Daly 236-48 2,918,119 12/1959Alger 158-115 2,941,588 6/1960 Blanz'y 158-115 2,967,022 1/1961 Wood etal. 239-99 3,069,089 12/1962 Demi 236-99 3,090,561 5/1963 Holzboog etal. 2361-68 3,091,395 5/1963 Douglas 236-68 3,132,803 5/1964 Wantz etal. 236-68 FOREIGN PATENTS 1,235,208 5/ 1960 France.

EDWARD I. MICHAEL, Primary Examiner.

PERCY L. PATRICK, Examiner.

1. A BURNER GAS VALVE CONSTRUCTION CONTROLLING THE FLOW OF BURNER GASFOR A BURNER COMPRISING: AN ELONGATED TUBULAR VALVE CASING WITH A GASINLET AT A FIRST VALVE CASING END, WITH A THERMOSTATIC MOTOR RECEIVINGOPENING AT A SECOND VALVE CASING END, AND WITH A GAS BURNER CONNECTORRECEIVING OPENING IN SAID CASING INTERMEDIATE SAID CASING ENDS; A VALVEGUIDE PIN INSERTABLE IN SAID VALVE CASING IN ALIGNMENT WITH SAIDCONNECTOR RECEIVING OPENING; A BURNER GAS VALVE SLIDABLY CARRIED BY SAIDGUIDE PIN AND HAVING A LEVER RECEIVING LOST MOTION NOTCH; A GAS BURNERCONNECTOR INSERTED IN SAID CONNECTOR RECEIVING OPENING AND HAVING AVALVE SEAT OPENED AND CLOSED BY SAID BURNER GAS VALVE; A VALVE ACTUATINGLEVER IN SAID CASING WITH ONE LEVER END PORTION ENGAGING SAID LOSTMOTION NOTCH, WITH THE OTHER LEVER END PORTION HAVING A VALVE LEVERFULCRUM ADJACENT SAID MOTOR RECEIVING OPENING AND WITH AN INTERMEDIATELEVER PORTION HAVING A MOVABLE SPRING FULCRUM; A FULCRUM LEVER IN SAIDCASING HAVING A NORMALLY STATIONARY LEVER SUPPORTING FULCRUM ENGAGINGSAID VALVE LEVER FULCRUM ADJACENT SAID MOTOR RECEIVING OPENING, HAVING AHOOK CONSTRUCTION AT ONE END ENGAGING A HOOK RECEIVING CONSTRUCTION ATSAID SECOND VALVE CASING END AND HAVING A NORMALLY STATIONARY SPRINGFULCRUM AT THE OTHER END; A COMPRESSION SPRING MEANS HAVING END PORTIONSRESPECTIVELY ENGAGING SAID SPRING LEVER FULCRUM AND SAID STATIONARYSPRING FULCRUM; AN END COVER REMOVABLY SECURED TO SAID SECOND VALVECASING END AND COVERING SAID MOTOR RECEIVING OPENING; AND A THERMOSTATICMOTOR CARRIED BY SAID COVER AND ENGAGING SAID VALVE ACTUATING LEVER TOOPERATE SAID VALVE ACTUATING LEVER IN COMBINATION WITH SAID SPRING MEANSTO MOVE SAID VALVE TOWARD AND AWAY FROM SAID VALVE SEAT.